Lifting



'No. 752,502. PATENTED FEB. 16, 1904;.

B. c'. YEAGER. LIFTIN-G JAGK.

APPLICATION FILED MAY 9. 1903.

N0 MODEL.

g STATES Patented February 16, 1904.

A ENT ICE EARNEST onnrisrnnenn, or nocKnr- L' erms.

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srncrrrcA rroiv forming air r Letters Patent no. 752,502,, dated.February 16, 1904.

To all whom it may concern.- XI i Be it known that I, EARNEST CURTISYEA- a horizontal plane; and one objectofmyin vention is to provide alight. jack having a detachable base which can be readily turned to ahorizontal or inclined positiomand' to provide theihorn of-the jack withgripping means 'whereby a pulling efiect may-be gained as distinguishedfromapushing effect and which' and the lower one has parallelforwardly-exwill enablethe operator to lift aload below 7 the-support onwhichthevjack is arranged or toexert a tension in a horizontal plane,asin st-retch-ing'a wire, wh-ich, in effect, would be thesame -aslifting a load from below the point on which the device was positioned.

My invention consists in a standard, a' horn sliding thereon, a leverpivotally connected to, the horn, clamping members'adapted toalternately grip and slide on the standard, and also in the details ofconstruction described hereinafter and particularly pointed out claims.

In the accompanying drawings, Figure l is a perspective view ofmy'device as seen from one side. Fig. 2- is an elevation, parts being insection. Fig. 3 is a detail perspective view of the horn and clampingmembers as seen from the opposite side of Fig. 1. Fig. 4 is aperspective view of one of the clamping members detached. Fig. 5 is adetail top. plan view of the standards, and Fig. 6 is a perspective viewof the horn detached.

In the drawings above described, A represents a standard out out alongthe sides, as at A, to make it lighter, its lower end fitting in adetachable base, which is adapted to be secured to a floor or platform.Sliding upon this standard is the horn B, comprising an upperforwardly-projecting portion B, curved in the Application filed May 9,1903- Serialll'o, 156,452. (No model) on its upper face and havinga'rearwardlyextending integral arm B, which is vertically and centrallyslotted at B adapting the arm to 'fit over and slide on the-standard.The

mainbody of the horn extends downwardly and has-a rearwardly extendingarm -B -recessed on one side, as shown at'Bfl the recess being adaptedto receive the standard and alining with the slotB In the'rear edge ofthe body portion intermediate thetwoarms is. formed a notchB Anupwardly-curved lever C is pivotally secured to one side' ofthe lowerbody portionof the horn-,the outer end ofthe lever being providedwith'the flanges C, between which is securedtheoperatinghandle 0 thishandle being on theopposite side-of the standard from the horn.

Two clamping members. I) are provided, each'of which jis'centrally cutout, as at D,

jacentthe lugs.'-='These clamping members slide loosely on the'standard;one of them being arranged-loathe standard between the lower armn 'Alink 'E' is pivoted atone end between'the "arms of the" horn'and theother one below the forming a shoulder F which engages the upper edge ofthe rear end of the lower clamping member.

Compound curved springs G are secured at one end in the sockets D andtheir opposite and upper ends bear against the standard. Each clampingmember is formed with an interior recess opening into the cut-outportion which projects from the recess and has a serrated surfaceadapted to bite into the standard.

On one side of the horn just below the curved portion is a lug H, andpivoted adjacent same is a member H, having a toothed curved face Hadapted to be swung upward away from the lug and to engage the lug whenswung downward.

At its upper end a plate J is secured to the standard, having a curvedlateral flange J and a stop-lug J A handle member J 3 is pivotallysecured on the plate. Its inner end has a curved serrated face J andwhen the hendle is pressed downward a rope or wire will he clampedbetween the serrated face and the curved flange, and the handle can bealso used for carrying the jack';.as the lug prevents the handle beingraised above a horizontal position.

The operation of my device. is as follows; When the handle C is in theposition shown in the drawings, the :lower member will be inclinedrelative to the standard, Q11 drawing downward on the handle thefulcrum-point of the lever C will be at the point where it is pivoted tothe link E and-the horn will be raised, lifting the upper link into ahorizontal position. When the movement of the lever is reversed, theupper member will grip-the standard and hold the horn in its elevatedposition, while the lower member will be drawn into a horizontalpositidn and lifted, .30 that when the lever is again in position to bedrawn downward the lower member will again grip the standard at a higherpoint, When it is desired to move the horn and clamping memberslfreelyon the standard,- the shoulder F D on the lower member and fits into thenotch B.

The springs aid in holding the clamping members at an angle to thestandard, and the member Hserves to clamp and hold a wire when theinstrument is used as a wirestretcher.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. A lifting-jack comprising alstandard, a horn having anupwardly-curved point, said horn being adapted to slide on the standard,a lever secured to the lower part of the horn, a clamping member slidingon the standard above the lever and adapted to engage the horn, aclamping member sliding on the standard below and piVotally. connectedto the lever, and a bar pivoted intermediate its ends.

and adapted to engage the clamping members.

2, In a lifting-jack, a Standard, a horn comprising aforwardlyprojecting portion curved on its upper face and having arearwardlyprojecting slotted arm adapted to slide on the standard, and adownwardly extending body portion notched on its inner side adjacent itslower end, and having an integral, rearwardlyextending arm, one side ofsaid arm being recessed for the purpose specified.

3,. A lifting-jack comprising a standard, a horn sliding on same,clamping members, the upper clamping member being loosely secured on thestandard between the horn and the lever, and the lower member beingpositioned below the lever, the upper member having a nose adapted toengage a notch formed in the horn, and carrying a block having aserratedface adapted to bite into one side of the standard, and vthe lowermember having a similar block adapted to engage the side of thestandard, a link connecting the lower clamping member to the lever, andsprings secured in the clamping members and bearing on the bar.

EARNEST CURTIS YEAGER.

Witnesses:

J. B, ASHBY, W. H. DUNCAN.

